A．courseB．lengthC．timeD．state
A. course
B. length
C. time
D. state
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It can be inferred from this passage that the feathers of a bird are colored
A. to frighten its enemies
B. to attract its enemies
C. to adjust its body heat
D. to match its environment
A．withB．toC．ofD．for
A. with
B. to
C. of
D. for
Which of the following is true according to the passage？
A. The widowed seem to have a longer life expectance.
B. Those who have a normal marriage life live longer than those who do not.
C. Single people live a shorter life because they are lonely.
D. Mothers of four children live a longer life than childless women.
The most prominent characteristic of handwriting is undoubtedly letter formation
A. presumably
B. in many cases
C. surely
D. without bias
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